CN203929981U - A kind of fault electric arc testing circuit - Google Patents
A kind of fault electric arc testing circuit Download PDFInfo
- Publication number
- CN203929981U CN203929981U CN201420318002.0U CN201420318002U CN203929981U CN 203929981 U CN203929981 U CN 203929981U CN 201420318002 U CN201420318002 U CN 201420318002U CN 203929981 U CN203929981 U CN 203929981U
- Authority
- CN
- China
- Prior art keywords
- electric arc
- fault electric
- circuit
- current
- sampling unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Testing Relating To Insulation (AREA)
Abstract
A kind of fault electric arc testing circuit belongs to arc-detection field, comprise ratio amplifying circuit, adder circuit, low-pass filter circuit and AD sampling unit in the same way, the variation of over-sampling size of current has judged whether that fault electric arc produces, and expands the sensing range of fault electric arc; The described amplifying circuit of ratio in the same way can amplify being difficult for fault electric arc electric current being detected by the single-chip microcomputer in AD sampling unit; Because flame current has negative half period, so add a direct current biasing, be input in described adder circuit, flame current has become the direct current signal that has suitable amplitude, has met the requirement of AD sampling unit sampling; When producing, fault electric arc can follow many high fdrequency components, through described low-pass filter circuit, obtain fundamental signal, fundamental signal is sent to described AD sampling unit, described AD sampling unit has judged whether that by detecting big or small whether change of first-harmonic fault electric arc produces again.
Description
Technical field
The utility model belongs to arc-detection field, relates to a kind of testing circuit, specifically refers to a kind of fault electric arc testing circuit.
Background technology
Fault electric arc isolating switch (Arc Fault Circuit Interrupters, be called for short AFCI) technology is a up-to-date circuit protection technology, and Main Function is to prevent the fire that caused by fault electric arc.While there is arc fault; because strength of current is less; lower than the setting value of the overcurrent protection that particularly extensively install in low-voltage distribution field of electric system at present and general overcurrent protection, all can reserve certain time delay; in distribution line terminal, fault electric arc isolating switch (AFCI) is installed and is found in time electric arc and cut off circuit, effectively reduce the damnous measure of electric arc.
The principal character of fault electric arc shows the aspects such as electric current, voltage and flash of light, air pressure, temperature, therefore the ultimate principle of arc-detection is exactly by specific device or circuit, detect arc light, infrared heat energy, electromagnetic wave that electric arc sends, identify the existence of electric arc.
The arc fault detection of being used widely is at present mainly to detect arc light mode.Utilize flash of light sniffer to detect the specific arc light frequency spectrum that arc fault produces, simultaneously to arc voltage signal carry out data processing, judgement then according to algorithm judgement send trip signal, the isolating switch that arc fault occurs is divided.This arc method for measuring is mainly used in power distribution cabinet.Owing to relying on arc light identification, therefore sensing range is subject to certain restrictions, general is not suitable in terminal distribution line.
Utility model content
The purpose of this utility model is to provide a kind of fault electric arc testing circuit, normal mains current is that frequency is the sine wave of 50HZ, and fault electric arc electric current is one with " Ping Jian district " and amplitude, to have the sine wave significantly reducing, the utility model is that the variation by sample rate current size has judged whether that fault electric arc produces, and expands the sensing range of fault electric arc.
For achieving the above object, the technical scheme that a kind of fault electric arc testing circuit adopts is: comprise ratio amplifying circuit, adder circuit, low-pass filter circuit and AD sampling unit in the same way, variation by sample rate current size has judged whether that fault electric arc produces, the amplitude of fault electric arc electric current less being difficult for detected by the single-chip microcomputer in AD sampling unit, by the described amplifying circuit of ratio in the same way, flame current can be amplified; Because flame current has negative half period, so add a direct current biasing, be input in described adder circuit, flame current has become the direct current signal that has suitable amplitude, has met the requirement of AD sampling unit sampling; When producing, fault electric arc can follow many high fdrequency components, through described low-pass filter circuit, obtain fundamental signal, fundamental signal is sent to described AD sampling unit, described AD sampling unit has judged whether that by detecting big or small whether change of first-harmonic fault electric arc produces again.
In ratio amplifying circuit in the same way, P1 be one by zero line or live wire through current transformer, the current signal that P1 samples has formed voltage signal after sampling resistor R3, operational amplifier U1A, resistance R 4 and slide rheostat U3 form ratio amplifying circuit in the same way, by regulating the resistance of slide rheostat U3 can change the multiple that amplifier amplifies.
In adder circuit, the direct current biasing that one end of resistance R 1 contact resistance R9 and diode D1 is 1.4V, its implementation is to carry out voltage clamping by D1, two high-frequency diodes of D2, and a diode has the pressure drop of 0.7V, and two diodes just have the clamp voltage of 1.4V.Arc signal is together input in the adder circuit consisting of operational amplifier U1B, resistance R 1, R2, R5 and R6 and obtains DC current with 1.4V direct current biasing again after amplifying.
In low-pass filter circuit, the DC current that adder circuit obtains is by operational amplifier U2, after the Butterworth low-pass filter circuit that capacitor C 1, C2 and resistance R 7, R8 form, obtain fundamental signal, then the single-chip microcomputer that fundamental signal is input in AD sampling unit carries out AD sampling.
Accompanying drawing explanation
Fig. 1 is the fundamental diagram of the present embodiment.
Embodiment
Below in conjunction with embodiment and accompanying drawing thereof, the utility model is remake to description.
Referring to Fig. 1, a kind of fault electric arc testing circuit, comprises ratio amplifying circuit, adder circuit, low-pass filter circuit, AD sampling unit in the same way; Ratio amplifying circuit is input to adder circuit after arc signal is amplified and processes in the same way, the DC current obtaining is input to low-pass filter circuit, low-pass filter circuit obtains fundamental signal by its processing, fundamental signal is input to AD sampling unit and carries out AD sampling.
Claims (4)
1. a fault electric arc testing circuit, comprises ratio amplifying circuit, adder circuit, low-pass filter circuit and AD sampling unit in the same way; It is characterized in that: the variation by sample rate current size has judged whether that fault electric arc produces, expand the sensing range of fault electric arc; The amplitude of fault electric arc electric current general less being difficult for detected by the single-chip microcomputer in AD sampling unit, by the described amplifying circuit of ratio in the same way, flame current can be amplified; Because flame current has negative half period, so add a direct current biasing, be input in described adder circuit, flame current has become the direct current signal that has suitable amplitude, has met the requirement of AD sampling unit sampling; When producing, fault electric arc can follow many high fdrequency components, through described low-pass filter circuit, obtain fundamental signal, fundamental signal is sent to described AD sampling unit, described AD sampling unit has judged whether that by detecting big or small whether change of first-harmonic fault electric arc produces again.
2. a kind of fault electric arc testing circuit according to claim 1, it is characterized by: in ratio amplifying circuit in the same way, P1 be one by zero line or live wire through current transformer, the current signal that P1 samples has formed voltage signal after sampling resistor R3, operational amplifier U1A, resistance R 4 and slide rheostat U3 form ratio amplifying circuit in the same way, by regulating the resistance of slide rheostat U3 can change the multiple that amplifier amplifies.
3. a kind of fault electric arc testing circuit according to claim 1, it is characterized by: in adder circuit, the direct current biasing that one end of resistance R 1 contact resistance R9 and diode D1 is 1.4V, its implementation is to carry out voltage clamping by D1, two high-frequency diodes of D2, a diode has the pressure drop of 0.7V, two diodes just have the clamp voltage of 1.4V, and arc signal is together input in the adder circuit consisting of operational amplifier U1B, resistance R 1, R2, R5 and R6 and obtains DC current with 1.4V direct current biasing again after amplifying.
4. a kind of fault electric arc testing circuit according to claim 1, it is characterized by: in low-pass filter circuit, the DC current that adder circuit obtains is by operational amplifier U2, after the Butterworth low-pass filter circuit that capacitor C 1, C2 and resistance R 7, R8 form, obtain fundamental signal, then the single-chip microcomputer that fundamental signal is input in AD sampling unit carries out AD sampling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420318002.0U CN203929981U (en) | 2014-06-14 | 2014-06-14 | A kind of fault electric arc testing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420318002.0U CN203929981U (en) | 2014-06-14 | 2014-06-14 | A kind of fault electric arc testing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203929981U true CN203929981U (en) | 2014-11-05 |
Family
ID=51825778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420318002.0U Expired - Fee Related CN203929981U (en) | 2014-06-14 | 2014-06-14 | A kind of fault electric arc testing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203929981U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459358A (en) * | 2014-11-10 | 2015-03-25 | 国家电网公司 | Detection device for residual charge of high-voltage electrical equipment |
| CN110806522A (en) * | 2019-11-12 | 2020-02-18 | 天津津航计算技术研究所 | Arc signal detection conditioning circuit |
| CN111426921A (en) * | 2020-04-17 | 2020-07-17 | 珠海泰特微电子股份有限公司 | Arc detection circuit and detection method thereof |
| US11569649B2 (en) | 2020-11-03 | 2023-01-31 | Delta Electronics, Inc. | Signal sampling circuit for arc detection |
-
2014
- 2014-06-14 CN CN201420318002.0U patent/CN203929981U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459358A (en) * | 2014-11-10 | 2015-03-25 | 国家电网公司 | Detection device for residual charge of high-voltage electrical equipment |
| CN110806522A (en) * | 2019-11-12 | 2020-02-18 | 天津津航计算技术研究所 | Arc signal detection conditioning circuit |
| CN111426921A (en) * | 2020-04-17 | 2020-07-17 | 珠海泰特微电子股份有限公司 | Arc detection circuit and detection method thereof |
| CN111426921B (en) * | 2020-04-17 | 2022-09-02 | 珠海泰特微电子股份有限公司 | Arc detection circuit and detection method thereof |
| US11569649B2 (en) | 2020-11-03 | 2023-01-31 | Delta Electronics, Inc. | Signal sampling circuit for arc detection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203929981U (en) | A kind of fault electric arc testing circuit | |
| CN104614608A (en) | Detection device and method for low voltage parallel electric arc fault | |
| CN104237737A (en) | Fault arc frequency domain detection device | |
| CN103645396A (en) | Method and device for low-voltage arc fault detection | |
| CN204065213U (en) | Zero sequence current mutual inductor break detection circuit and residual current detection circuit | |
| CN102662095A (en) | Three-phase voltage sampling circuit | |
| CN102680766A (en) | Three-phase voltage sampling circuit for control and protection switches | |
| CN203745608U (en) | Portable relay detector | |
| CN201956656U (en) | Intellectual earth leakage protection apparatus | |
| CN205192536U (en) | Electrical equipment temperature monitoring device | |
| CN105067945A (en) | Intelligent detection unit with direct-current arcing detection function and junction box | |
| CN203981767U (en) | Fault electric arc sampling and pick-up unit | |
| CN104574770A (en) | Electrical fire monitoring detector with fault detection circuit | |
| CN204330871U (en) | A kind of low pressure parallel arc fault pick-up unit | |
| RU2010151785A (en) | DEVICE AND METHOD OF DIFFERENTIAL PROTECTION AND ELECTRICAL INSTRUMENT CONTAINING SUCH DEVICE | |
| CN203606470U (en) | Asynchronous time live-line measuring device for circuit breaker | |
| CN205544257U (en) | From switching surge protector | |
| CN102590719A (en) | Surface mounted device (SMD) sensor device for detecting local discharge of power cable terminal head | |
| CN204992521U (en) | Electric energy meter that single -phase electric energy meter operated a switch control circuit and made with this circuit | |
| CN103376389B (en) | A kind of fault electric arc for low-voltage circuit judges system and determination methods thereof | |
| CN202562994U (en) | Three-phase voltage sampling circuit used for control and protection switch | |
| CN205158598U (en) | Electric fire monitors detector with failure detector circuit | |
| CN112881946B (en) | Double-core current transformer disconnection detection method and device and circuit breaker | |
| CN204720959U (en) | EN dividing potential drop sampling type earth leakage protective device | |
| CN205157748U (en) | Fire control device power monitored control system data acquisition circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180507 Address after: 300171 six Hewei Road, Hedong District, Tianjin, and Wan Hai building, 2511, Dazhi Gu eight road. Patentee after: Tianjin he pole electrical technology Co.,Ltd. Address before: 325600 Yueqing Economic Development Zone, Wenzhou, Zhejiang, 159 No. 6 road. Patentee before: ZHEJIANG HEJI ELECTRIC TECHNOLOGY CO.,LTD. |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141105 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |